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Earth leakage detection device

A leakage detection and output voltage technology, which is applied to measuring devices, circuit devices, emergency protection circuit devices, etc., can solve problems such as failure to identify leakage

Active Publication Date: 2015-07-08
PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, although the earth leakage breaker disclosed in Patent Document 1 performs earth leakage interruption, it does not display the earth leakage by effective value or the like based on the output voltage of the zero-phase converter.
Therefore, managers and the like cannot recognize to what extent electric leakage has occurred

Method used

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Examples

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no. 1 approach

[0105] figure 1 It is a block diagram showing a configuration example of the leakage detection device in the first embodiment of the present invention. figure 1 The shown leakage detection device 100 is configured to include a zero-phase current transformer 10 , an integral calculation unit 20 , an integral value comparison unit 30 , a waveform discrimination unit 40 , and a leakage detection unit 50 .

[0106] The zero-phase converter 10 is composed of an annular iron core (core) and a toroidal coil wound on the core, wherein the iron core is formed of a magnetic body such as a soft magnetic material, and constitutes a three-phase circuit. A plurality of primary conductors of an alternating current circuit pass through the iron core. When a difference occurs between the current flowing in the outward direction and the current flowing in the homeward direction of the AC circuit, a leakage current based on the difference is generated in the zero-phase converter 10 . Further...

no. 2 approach

[0148] Such as Figure 8 As shown, the leakage detection device 100 of the second embodiment includes a waveform discrimination unit 40B instead of the waveform discrimination unit 40 shown in the first embodiment. In addition, the same code|symbol is attached|subjected to the structure of the leakage detection device 100 of this embodiment which is the same as that of the leakage detection device 100 shown in 1st Embodiment, and description is abbreviate|omitted.

[0149] Figure 8 It is a block diagram showing a configuration example of the waveform discrimination unit 40B in the second embodiment of the present invention. Figure 8 The illustrated waveform discrimination unit 40B includes a count value changing unit 43 in addition to the pulse generating unit 41 and the pulse counting unit 42 .

[0150] The count value changing unit 43 is composed of a control circuit and the like, detects the pulse output width based on the pulse generated by the pulse generating unit 41...

no. 3 approach

[0161] The leakage detection device 100 of the third embodiment includes a waveform discrimination unit 40C instead of the waveform discrimination unit 40 shown in the first embodiment. In addition, the components of the leakage detection device 100 of the present embodiment that are the same as those of the leakage detection device 100 shown in the first embodiment are denoted by the same symbols, and description thereof will be omitted.

[0162] Figure 10 It is a block diagram showing a configuration example of the waveform discrimination unit 40C in the third embodiment of the present invention. Figure 10 The illustrated waveform discrimination unit 40C includes a pulse generation condition changing unit 44 in addition to the pulse generation unit 41 and the pulse count unit 42 .

[0163] The pulse generation condition change unit 44 is composed of a control circuit, etc., and changes the pulse generation condition of the pulse generation unit 41 and / or the pulse count c...

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Abstract

Provided is an earth leakage detection device capable of quickly distinguishing between an ordinary earth leakage and a thunder surge. The earth leakage detection device comprises: a zero-phase current transformer (ZCT) (10) through which AC cable runs pass; an integration calculation unit (20) for integrating the output voltage of the zero-phase current transformer (10); an integrated value comparison unit (30) for, when the calculation result obtained by the integration calculation unit (20) is greater than a predetermined range, outputting a first signal; a waveform identification unit (40) for detecting and counting the inflection points of the output voltage waveform of the zero-phase current transformer and for, when the number of the inflection points reaches a predetermined number, outputting a second signal; and an earth current detection unit (50) for, when the integrated value comparison unit (30) outputs the first signal and the waveform identification unit (40) outputs the second signal, outputting an earth leakage detection signal indicating that earth leakage is occurring in the AC cable runs.

Description

[0001] This application is a divisional application of the application dated March 22, 2012, the application number is 201280014407.9 (the international application number is PCT / IB2012 / 000560), and the invention name is "leakage detection device". technical field [0002] The invention relates to a leakage detection device. In particular, it relates to a leakage detection device for judging whether leakage occurs in an AC circuit according to the detection output of a zero-phase current transformer. Background technique [0003] The leakage interruption device has a zero-phase current transformer (ZCT) composed of an annular iron core (core) and a toroidal (toroidal) coil wound on the core, wherein the iron core is made of a soft magnetic material, etc. The magnetic body is formed, and a plurality of primary conductors constituting an AC circuit pass through the iron core, and the leakage cut-off device determines whether there is a fault in the plurality of primary conduct...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/02H02H3/32
CPCG01R31/025G01R31/52
Inventor 山添宏一田中毅神田雅隆盐川明实
Owner PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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